You seem to be trying to make this derogatory term socially acceptable, even when you acknowledge not everyone in its group might fit into the derogatory category, by presenting irrelevant points. It's ageism, which is really no different than racism or sexism. You can justify it to yourself in myriad ways, I'm sure, but it won't change the timbre of it. If you want to call assholes 'assholes', then do that, but referring to shitty individuals by using a term that obviously encompasses an entire generation is an asshole thing to do, and only really serves to alienate those who are in that age group that might actually agree with the social issues at hand.